Question about 1987 Honda XR 250 R

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Trying to remove magneto on 1987 honda xr80 bike will not fire

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First you need to get a fly wheel puller. then remove the nut in the middle of fly wheel,insert fly wheel puller,reverce thread,tighten pin and it will pop off fly wheel.when you put it back on remember to line up "woodruff key",its a little notch on fly wheel whitch lines up with a ridge on cam shaft. if you cant fix your problem and you have spark its probobly your coil and condencer.

Posted on Sep 21, 2009

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Posted on Jan 02, 2017

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My 1987 yamaha warrior 350 runs back and backfires, have tried everything (carvs, fuel, sparkplug, etc.) Im now looking at the pulse pickup, could that be a problem?


my bike had that symptom and the problem was that the key between the magneto and the crankshaft cutted in two and the magneto a 45 degree to late and back fired. to verify, put your timing mark at tdc on the magneto (you see it from the hole on top of the cover. when it's tdc see if the piston is at top with a screw driver through the spark plug hole, if its not at top, theres your problem.( sorry for the english im french)

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Backfiring through the carb isn't a timing issue unless you're firing at BDC (180 degrees out).
or have bad/missing/cracked piston rings / hole in the piston.
I mean, correct me if I am wrong, but that thing IS a 2 stroke, right?

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The magneto is inside the right side case cover.. I think the lutch is on the left side.. You can tell by where the cable goes in. good luck

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